package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.SetmealDTO;
import com.sky.dto.SetmealPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.SetmealDish;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.exception.SetmealEnableFailedException;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.SetmealService;
import com.sky.vo.DishItemVO;
import com.sky.vo.SetmealVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import java.util.List;

/**
 * 套餐业务实现
 */
@Service
@Slf4j
public class SetmealServiceImpl implements SetmealService {

    @Autowired
    private SetmealMapper setmealMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;
    @Autowired
    private DishMapper dishMapper;

    /**
     * 条件查询
     * @param setmeal
     * @return
     */
    public List<Setmeal> list(Setmeal setmeal) {
        List<Setmeal> list = setmealMapper.list(setmeal);
        return list;
    }

    /**
     * 根据id查询菜品选项
     * @param id
     * @return
     */
    public List<DishItemVO> getDishItemById(Long id) {
        return setmealMapper.getDishItemBySetmealId(id);
    }

    @Override
    @Transactional//保证两次插入操作要么同时成功，要么同时失败
    public void save(SetmealDTO setmealDTO) {
        //同时保存套餐与菜品的关联信息

        //1.新增套餐
        Setmeal setmeal=new Setmeal();
        BeanUtils.copyProperties(setmealDTO,setmeal);
        setmealMapper.save(setmeal);

        //获取插入套餐后生成的主键值（id）
        Long setmealId=setmeal.getId();

        //2.保存套餐与菜品的关联信息
        //获取套餐中的菜品
        List<SetmealDish> setmealDishes=setmealDTO.getSetmealDishes();
        for (SetmealDish setmealDish : setmealDishes) {
            //将套餐id设置进SetmelDish对象中
            setmealDish.setSetmealId(setmealId);
        }
        //将套餐id、菜品id等信息保存进setmeal_dish表
        setmealDishMapper.insertBatch(setmealDishes);
    }

    @Override
    public PageResult page(SetmealPageQueryDTO setmealPageQueryDTO) {
        PageHelper.startPage(setmealPageQueryDTO.getPage(),setmealPageQueryDTO.getPageSize());
        Page<SetmealVO> page=setmealMapper.page(setmealPageQueryDTO);
        return new PageResult(page.getTotal(),page.getResult());
    }

    @Override
    @Transactional
    public void delete(List<Long> ids) {
        //判断套餐起售状态
        for (Long id : ids) {
            Setmeal setmeal=setmealMapper.getById(id);
            if(setmeal.getStatus()== StatusConstant.ENABLE){
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }

        //删除套餐同时删除套餐与菜品的关联信息
        for (Long id : ids) {
            //删除套餐表中的数据
            setmealMapper.deleteById(id);
            //删除套餐菜品表中的关联数据
            setmealDishMapper.deleteBySetmealId(id);
        }
    }

    //根据id查询套餐及套餐菜品信息
    @Override
    public SetmealVO getSetmealById(Long id) {
        //查询套餐
        Setmeal setmeal=setmealMapper.getById(id);
        //获取套餐菜品关联信息
        List<SetmealDish> setmealDishes=setmealDishMapper.getBySetmealId(id);

        //封装SetMeal对象
        SetmealVO setmealVO=new SetmealVO();
        BeanUtils.copyProperties(setmeal,setmealVO);
        setmealVO.setSetmealDishes(setmealDishes);

        //将套餐信息以及套餐菜品信息返回
        return setmealVO;
    }

    //修改套餐信息
    @Override
    public void update(SetmealDTO setmealDTO) {
        Setmeal setmeal=new Setmeal();
        BeanUtils.copyProperties(setmealDTO,setmeal);

        //1.修改套餐信息
        setmealMapper.update(setmeal);

        Long setmealId=setmealDTO.getId();
        //2.删除套餐与菜品间的联系
        setmealDishMapper.deleteBySetmealId(setmealId);

        //3.重新建立套餐与菜品间的联系
        List<SetmealDish> setmealDishes=setmealDTO.getSetmealDishes();
        for (SetmealDish setmealDish : setmealDishes) {
            setmealDish.setSetmealId(setmealId);
        }
        setmealDishMapper.insertBatch(setmealDishes);
    }

    @Override
    public void status(Integer status, Long id) {
        //将停售套餐变为起售时，先判断套餐内是否包含停售菜品，如果包含，则无法起售
        if(status==StatusConstant.ENABLE){
            //根据套餐id查菜品表，返回一个集合
            List<Dish> dishes = dishMapper.getDish(id);
            if(dishes!=null&&dishes.size()>0){
                for (Dish dish : dishes) {
                    //菜品集合中包含停售菜品时
                    if(dish.getStatus()==StatusConstant.DISABLE){
                        throw new SetmealEnableFailedException(MessageConstant.SETMEAL_ENABLE_FAILED);
                    }
                }
            }
        }
        //修改状态
        Setmeal setmeal=new Setmeal();
        setmeal.setStatus(status);
        setmeal.setId(id);
        setmealMapper.update(setmeal);
    }

    /**
     * 新增套餐，同时增加套餐和菜品关系
     * @param setmealDTO
     */
    @Override
    @Transactional
    public void saveWithDish(SetmealDTO setmealDTO) {
        Setmeal setmeal=new Setmeal();
        BeanUtils.copyProperties(setmealDTO ,setmeal);

        //向套餐表插入数据
        setmealMapper.insert(setmeal);
        //获取生成的套餐id
        Long id = setmeal.getId();
        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        setmealDishes.forEach(setmealDish -> {
            setmealDish.setSetmealId(id);
        });
        //保存套餐和菜品的关系
        setmealDishMapper.insertBatch(setmealDishes);
    }

    /**
     * 分页查询
     * @param setmealPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(SetmealPageQueryDTO setmealPageQueryDTO) {
        int pageNum=setmealPageQueryDTO.getPage();
        int pageSize=setmealPageQueryDTO.getPageSize();

        PageHelper.startPage(pageNum,pageSize);
        Page<SetmealVO> page=setmealMapper.pageQuery(setmealPageQueryDTO);
        return new PageResult(page.getTotal(),page.getResult());
    }

    /**
     * 批量删除套餐
     * @param ids
     */
    @Transactional
    public void deleteBatch(List<Long> ids) {
        ids.forEach(id -> {
            Setmeal setmeal = setmealMapper.getById(id);
            if(StatusConstant.ENABLE == setmeal.getStatus()){
                //起售中的套餐不能删除
                throw new DeletionNotAllowedException(MessageConstant.SETMEAL_ON_SALE);
            }
        });

        ids.forEach(setmealId -> {
            //删除套餐表中的数据
            setmealMapper.deleteById(setmealId);
            //删除套餐菜品关系表中的数据
            setmealDishMapper.deleteBySetmealId(setmealId);
        });
    }

    /**
     * 根据id查询套餐和套餐菜品关系
     *
     * @param id
     * @return
     */
    public SetmealVO getByIdWithDish(Long id) {
        Setmeal setmeal = setmealMapper.getById(id);
        List<SetmealDish> setmealDishes = setmealDishMapper.getBySetmealId(id);

        SetmealVO setmealVO = new SetmealVO();
        BeanUtils.copyProperties(setmeal, setmealVO);
        setmealVO.setSetmealDishes(setmealDishes);

        return setmealVO;
    }

    /**
     * 套餐起售、停售
     * @param status
     * @param id
     */
    public void startOrStop(Integer status, Long id) {
        //起售套餐时，判断套餐内是否有停售菜品，有停售菜品提示"套餐内包含未启售菜品，无法启售"
        if(status == StatusConstant.ENABLE){
            //select a.* from dish a left join setmeal_dish b on a.id = b.dish_id where b.setmeal_id = ?
            List<Dish> dishList = dishMapper.getBySetmealId(id);
            if(dishList != null && dishList.size() > 0){
                dishList.forEach(dish -> {
                    if(StatusConstant.DISABLE == dish.getStatus()){
                        throw new SetmealEnableFailedException(MessageConstant.SETMEAL_ENABLE_FAILED);
                    }
                });
            }
        }

        Setmeal setmeal = Setmeal.builder()
                .id(id)
                .status(status)
                .build();
        setmealMapper.update(setmeal);
    }

}
